:root {
    --color-primary-900: #0f172a;
    --color-primary-800: #1e293b;
    --color-primary-700: #334155;
    --color-primary-600: #2563eb;
    --color-primary-500: #3b82f6;
    --color-primary-50: #eff6ff;
    --color-primary-100: #dbeafe;
    
    --color-secondary-50: #f8fafc;
    --color-secondary-100: #f1f5f9;
    --color-secondary-200: #e2e8f0;
    --color-secondary-300: #cbd5e1;
    --color-secondary-800: #1e293b;
    --color-secondary-900: #0f172a;
    
    --color-success-50: #f0fdf4;
    --color-success-100: #dcfce7;
    --color-success-600: #16a34a;
    --color-danger-50: #fef2f2;
    --color-danger-100: #fee2e2;
    --color-danger-600: #dc2626;
    --color-warning-50: #fefce8;
    --color-warning-100: #fef9c3;
    --color-warning-600: #ca8a04;
    --color-info-50: #eff6ff;
    --color-info-100: #dbeafe;
    --color-info-600: #2563eb;

    --bg-body: #f8fafc;
    --bg-surface: #ffffff;
    --bg-sidebar: #0f172a;
    
    --text-base: #475569;
    --text-strong: #0f172a;
    --text-muted: #64748b;
    --text-inverse: #f8fafc;
    
    --border-color: #e2e8f0;
    --border-color-sidebar: #1e293b;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    
    --transition-speed: 0.2s;
    
    --sidebar-width: 260px;
    --topbar-height: 64px;
    
    --spacing-xs: 0.375rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1.25rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Inter', sans-serif; color: var(--text-base); background-color: var(--bg-body); line-height: 1.5; font-size: 0.875rem; }
a { color: var(--color-primary-600); text-decoration: none; transition: color var(--transition-speed); }
a:hover { color: var(--color-primary-800); }
.admin-body { display: flex; height: 100vh; overflow: hidden; }

.sidebar { width: var(--sidebar-width); background-color: var(--bg-sidebar); color: var(--text-inverse); display: flex; flex-direction: column; transition: transform var(--transition-speed) ease; z-index: 100; box-shadow: var(--shadow-md); }
.sidebar-header { height: var(--topbar-height); display: flex; align-items: center; padding: 0 var(--spacing-md); border-bottom: 1px solid var(--border-color-sidebar); }
.logo-icon { font-size: 1.5rem; margin-right: var(--spacing-sm); color: #93c5fd; }
.logo-text { font-weight: 700; font-size: 1rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sidebar-toggle-close { display: none; background: none; border: none; color: var(--text-inverse); cursor: pointer; margin-left: auto; }
.sidebar-content { flex: 1; overflow-y: auto; padding: var(--spacing-md); }
.sidebar-content::-webkit-scrollbar { width: 6px; }
.sidebar-content::-webkit-scrollbar-thumb { background-color: #475569; border-radius: 3px; }
.sidebar-group { margin-bottom: var(--spacing-lg); }
.sidebar-group-title { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.05em; color: #cbd5e1; opacity: 0.9; margin-bottom: var(--spacing-sm); padding-left: var(--spacing-xs); font-weight: 600; }
.sidebar-link { display: flex; align-items: center; padding: 0.5rem var(--spacing-sm); color: #e2e8f0; opacity: 0.92; border-radius: var(--radius-md); margin-bottom: 2px; transition: all var(--transition-speed); }
.sidebar-link:hover { opacity: 1; background-color: #1e293b; color: #ffffff; }
.sidebar-link.active { opacity: 1; background-color: #2563eb; color: #ffffff; box-shadow: inset 3px 0 0 #bfdbfe; }
.sidebar-link .material-symbols-outlined { font-size: 1.25rem; margin-right: var(--spacing-sm); }

.sidebar-footer { padding: var(--spacing-md); border-top: 1px solid var(--border-color-sidebar); display: flex; align-items: center; justify-content: space-between; }
.user-info { display: flex; align-items: center; min-width: 0; }
.user-avatar { width: 32px; height: 32px; background-color: #1d4ed8; color: #ffffff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 600; margin-right: var(--spacing-sm); flex-shrink: 0; }
.user-details { display: flex; flex-direction: column; min-width: 0; }
.user-name { color: #f8fafc; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-size: 0.8rem; }
.user-role { color: #cbd5e1; font-size: 0.65rem; opacity: 0.85; }
.logout-btn { background: none; border: none; color: #cbd5e1; opacity: 0.85; cursor: pointer; padding: 0.25rem; border-radius: var(--radius-sm); transition: all var(--transition-speed); }
.logout-btn:hover { opacity: 1; background-color: #7f1d1d; color: #ffffff; }

.main-wrapper { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar { height: var(--topbar-height); background-color: var(--bg-surface); border-bottom: 1px solid var(--border-color); display: flex; align-items: center; justify-content: space-between; padding: 0 var(--spacing-md); box-shadow: var(--shadow-sm); z-index: 10; }
.topbar-left { display: flex; align-items: center; }
.menu-toggle { display: none; background: none; border: none; color: var(--text-muted); cursor: pointer; margin-right: var(--spacing-md); }
.page-title { font-size: 1.125rem; font-weight: 600; color: var(--text-strong); }
.topbar-right { display: flex; align-items: center; gap: var(--spacing-md); }

.global-search { position: relative; }
.global-search input { padding: 0.4rem 0.75rem 0.4rem 2rem; border: 1px solid var(--border-color); border-radius: var(--radius-md); background-color: var(--color-secondary-50); width: 250px; transition: all var(--transition-speed); font-size: 0.8rem; color: var(--text-strong); }
.global-search input:focus { outline: none; border-color: var(--color-primary-500); width: 300px; background-color: var(--bg-surface); box-shadow: 0 0 0 3px var(--color-primary-900); }
.global-search .search-icon { position: absolute; left: 0.5rem; top: 50%; transform: translateY(-50%); font-size: 1.125rem; color: var(--text-muted); pointer-events: none; }
.search-results { position: absolute; top: 100%; left: 0; width: 100%; background-color: var(--bg-surface); border: 1px solid var(--border-color); border-radius: var(--radius-md); box-shadow: var(--shadow-lg); margin-top: 0.25rem; max-height: 400px; overflow-y: auto; z-index: 50; }
.search-result-item { display: block; padding: var(--spacing-sm) var(--spacing-md); border-bottom: 1px solid var(--border-color); text-decoration: none; color: var(--text-base); }
.search-result-item:last-child { border-bottom: none; }
.search-result-item:hover { background-color: var(--color-secondary-50); }

.icon-btn { background: none; border: none; color: var(--text-muted); cursor: pointer; position: relative; padding: 0.25rem; border-radius: 50%; display: flex; align-items: center; justify-content: center; transition: background-color var(--transition-speed); }
.icon-btn:hover { background-color: var(--color-secondary-100); color: var(--text-strong); }
.icon-btn .badge { position: absolute; top: -2px; right: -2px; background-color: var(--color-danger-600); color: white; font-size: 0.65rem; font-weight: 700; min-width: 16px; height: 16px; border-radius: 8px; display: flex; align-items: center; justify-content: center; padding: 0 4px; border: 2px solid var(--bg-surface); }

.dropdown-container { position: relative; }
.dropdown-menu { position: absolute; top: 100%; right: 0; width: min(320px, calc(100vw - 2rem)); background-color: var(--bg-surface); border: 1px solid var(--border-color); border-radius: var(--radius-md); box-shadow: var(--shadow-lg); margin-top: 0.25rem; z-index: 500; }
.dropdown-header { padding: var(--spacing-sm) var(--spacing-md); border-bottom: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; }
.dropdown-header h3 { font-size: 0.875rem; font-weight: 600; margin: 0; }
.text-btn { background: none; border: none; color: var(--color-primary-600); font-size: 0.75rem; cursor: pointer; padding: 0; }
.text-btn:hover { text-decoration: underline; }
.dropdown-body { max-height: 350px; overflow-y: auto; }

.notification-item { display: flex; padding: var(--spacing-sm) var(--spacing-md); border-bottom: 1px solid var(--border-color); text-decoration: none; color: var(--text-base); }
.notification-item:hover { background-color: var(--color-secondary-50); }
.notification-icon { margin-right: var(--spacing-sm); margin-top: 2px; }
.notification-content h4 { margin: 0; font-size: 0.8rem; font-weight: 600; color: var(--text-strong); }
.notification-content p { margin: 2px 0 0; font-size: 0.75rem; color: var(--text-muted); }
.notification-time { font-size: 0.7rem; color: var(--color-secondary-300); display: block; margin-top: 4px; }

.main-content { flex: 1; padding: var(--spacing-lg); overflow-y: auto; }

.flash-message { display: flex; align-items: center; padding: 1rem 1.25rem; border-radius: var(--radius-md); margin-bottom: var(--spacing-lg); box-shadow: var(--shadow-sm); position: relative; border-left-width: 4px; border-left-style: solid; font-size: 0.875rem; font-weight: 500; }
.flash-text { margin-left: var(--spacing-sm); flex: 1; }
.flash-close { background: none; border: none; font-size: 1.25rem; cursor: pointer; opacity: 0.6; transition: opacity var(--transition-speed); display: flex; padding: 0.25rem; }
.flash-close:hover { opacity: 1; }
.flash-success { background-color: var(--color-success-50); color: var(--color-success-600); border-color: var(--color-success-100); border-left-color: var(--color-success-600); }
.flash-error { background-color: var(--color-danger-50); color: var(--color-danger-600); border-color: var(--color-danger-100); border-left-color: var(--color-danger-600); }
.flash-info { background-color: var(--color-info-50); color: var(--color-info-600); border-color: var(--color-info-100); border-left-color: var(--color-info-600); }
.flash-warning { background-color: var(--color-warning-50); color: var(--color-warning-600); border-color: var(--color-warning-100); border-left-color: var(--color-warning-600); }

.d-none { display: none !important; }
.mt-md { margin-top: var(--spacing-md); }
.text-center { text-align: center; }
.empty-state { padding: var(--spacing-xl); text-align: center; color: var(--text-muted); background: var(--color-secondary-50); border: 1px dashed var(--border-color); border-radius: var(--radius-lg); margin: var(--spacing-md) 0; }

.btn { display: inline-flex; align-items: center; justify-content: center; padding: 0.5rem 1rem; font-size: 0.875rem; font-weight: 500; border-radius: var(--radius-md); border: 1px solid transparent; cursor: pointer; transition: all var(--transition-speed); font-family: inherit; text-decoration: none; gap: 0.5rem; }
.btn-primary { background-color: var(--color-primary-600); color: white; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background-color: var(--color-primary-500); box-shadow: var(--shadow-md); transform: translateY(-1px); }
.btn-outline { border-color: var(--border-color); background-color: var(--bg-surface); color: var(--text-strong); }
.btn-outline:hover { background-color: var(--color-secondary-50); border-color: var(--color-secondary-300); }
.btn-sm { padding: 0.375rem 0.625rem; font-size: 0.75rem; }
.btn-lg { padding: 0.75rem 1.5rem; font-size: 1rem; }

.card { background-color: var(--bg-surface); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); border: 1px solid var(--border-color); margin-bottom: var(--spacing-lg); overflow: visible; transition: box-shadow var(--transition-speed); }
.card:hover { box-shadow: var(--shadow-md); }
.card-header { padding: var(--spacing-md) var(--spacing-lg); border-bottom: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; background-color: var(--bg-surface); }
.card-title { font-size: 1rem; font-weight: 600; margin: 0; color: var(--text-strong); }
.card-body { padding: var(--spacing-lg); }

.error-page-container { display: flex; align-items: center; justify-content: center; min-height: calc(100vh - var(--topbar-height) - 4rem); }
.error-card { text-align: center; max-width: 400px; padding: 2rem; }

@media (max-width: 768px) {
    .admin-body { position: relative; }
    .sidebar { position: fixed; left: 0; top: 0; bottom: 0; transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .menu-toggle, .sidebar-toggle-close { display: block; }
    .global-search input { width: 150px; }
    .global-search input:focus { width: 200px; }
    
    /* Table Responsive for mobile */
    .table-responsive { display: block; width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
    .table { white-space: nowrap; }
}

/* Modals */
.modal { position: fixed; z-index: 1000; left: 0; top: 0; width: 100%; height: 100%; overflow: auto; background-color: rgba(15, 23, 42, 0.6) !important; display: flex; align-items: center; justify-content: center; padding: var(--spacing-md); backdrop-filter: blur(4px); transition: opacity var(--transition-speed); }
.modal-content { background-color: var(--bg-surface) !important; width: min(92vw, 100%) !important; max-height: calc(100vh - (var(--spacing-md) * 2)) !important; overflow-y: auto !important; padding: var(--spacing-xl) !important; border: 1px solid var(--border-color) !important; border-radius: var(--radius-lg) !important; box-shadow: var(--shadow-lg) !important; transition: transform var(--transition-speed); transform: scale(1); }
.modal.d-none { display: none !important; opacity: 0; }
.modal.d-none .modal-content { transform: scale(0.95); }

/* Forms */
.form-group { margin-bottom: var(--spacing-md); }
.form-control, .form-select { display: block; width: 100%; padding: 0.5rem 0.75rem; font-size: 0.875rem; line-height: 1.5; color: var(--text-strong); background-color: var(--bg-surface); background-clip: padding-box; border: 1px solid var(--border-color); border-radius: var(--radius-md); transition: border-color var(--transition-speed); font-family: inherit; }
.form-control:focus, .form-select:focus { outline: none; border-color: var(--color-primary-500); box-shadow: 0 0 0 3px var(--color-primary-900); }
label { display: inline-block; margin-bottom: 0.25rem; font-weight: 500; color: var(--text-base); font-size: 0.875rem; }

/* Utilities - Flex */
.d-flex { display: flex !important; }
.flex-column { flex-direction: column !important; }
.flex-wrap { flex-wrap: wrap !important; }
.justify-content-between { justify-content: space-between !important; }
.justify-content-center { justify-content: center !important; }
.justify-content-end { justify-content: flex-end !important; }
.align-items-center { align-items: center !important; }
.align-items-start { align-items: flex-start !important; }
.align-items-end { align-items: flex-end !important; }
.flex-1 { flex: 1 !important; }

/* Utilities - Grid */
.grid { display: grid !important; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)) !important; }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)) !important; }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)) !important; }
@media (min-width: 768px) {
    .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; }
    .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)) !important; }
}

/* Utilities - Spacing */
.m-0 { margin: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }
.mb-xs { margin-bottom: var(--spacing-xs) !important; }
.mb-sm { margin-bottom: var(--spacing-sm) !important; }
.mb-md { margin-bottom: var(--spacing-md) !important; }
.mb-lg { margin-bottom: var(--spacing-lg) !important; }
.mb-xl { margin-bottom: var(--spacing-xl) !important; }
.mt-0 { margin-top: 0 !important; }
.mt-xs { margin-top: var(--spacing-xs) !important; }
.mt-sm { margin-top: var(--spacing-sm) !important; }
.mt-md { margin-top: var(--spacing-md) !important; }
.mt-lg { margin-top: var(--spacing-lg) !important; }
.mt-xl { margin-top: var(--spacing-xl) !important; }
.ml-sm { margin-left: var(--spacing-sm) !important; }
.ml-md { margin-left: var(--spacing-md) !important; }
.mr-sm { margin-right: var(--spacing-sm) !important; }
.mr-md { margin-right: var(--spacing-md) !important; }
.my-md { margin-top: var(--spacing-md) !important; margin-bottom: var(--spacing-md) !important; }

.p-0 { padding: 0 !important; }
.p-xs { padding: var(--spacing-xs) !important; }
.p-sm { padding: var(--spacing-sm) !important; }
.p-md { padding: var(--spacing-md) !important; }
.p-lg { padding: var(--spacing-lg) !important; }
.px-md { padding-left: var(--spacing-md) !important; padding-right: var(--spacing-md) !important; }
.py-xs { padding-top: var(--spacing-xs) !important; padding-bottom: var(--spacing-xs) !important; }
.py-sm { padding-top: var(--spacing-sm) !important; padding-bottom: var(--spacing-sm) !important; }
.py-md { padding-top: var(--spacing-md) !important; padding-bottom: var(--spacing-md) !important; }
.py-lg { padding-top: var(--spacing-lg) !important; padding-bottom: var(--spacing-lg) !important; }
.py-xl { padding-top: var(--spacing-xl) !important; padding-bottom: var(--spacing-xl) !important; }
.pt-lg { padding-top: var(--spacing-lg) !important; }
.pb-md { padding-bottom: var(--spacing-md) !important; }

.gap-xs { gap: var(--spacing-xs) !important; }
.gap-sm { gap: var(--spacing-sm) !important; }
.gap-md { gap: var(--spacing-md) !important; }
.gap-lg { gap: var(--spacing-lg) !important; }

/* Utilities - Colors */
.bg-secondary-50 { background-color: var(--color-secondary-50) !important; }
.text-primary { color: var(--color-primary-600) !important; }
.text-muted { color: var(--text-muted) !important; }
.text-danger { color: var(--color-danger-600) !important; }
.text-success { color: var(--color-success-600) !important; }
.text-warning { color: var(--color-warning-600) !important; }

/* Utilities - Typography */
.text-xs { font-size: 0.75rem !important; }
.text-sm { font-size: 0.875rem !important; }
.text-base { font-size: 1rem !important; }
.text-lg { font-size: 1.125rem !important; }
.text-xl { font-size: 1.25rem !important; }
.font-bold { font-weight: 700 !important; }
.font-mono { font-family: monospace !important; }
.text-right { text-align: right !important; }

/* Utilities - Borders & Misc */
.w-100 { width: 100% !important; }
.min-w-150 { min-width: 150px !important; }
.min-w-200 { min-width: 200px !important; }
.border { border: 1px solid var(--border-color) !important; }
.border-top { border-top: 1px solid var(--border-color) !important; }
.border-bottom { border-bottom: 1px solid var(--border-color) !important; }
.border-color { border-color: var(--border-color) !important; }
.border-radius-sm { border-radius: var(--radius-sm) !important; }
.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.relative { position: relative !important; }
.absolute { position: absolute !important; }
.container { max-width: 1200px; margin-left: auto; margin-right: auto; padding-left: var(--spacing-md); padding-right: var(--spacing-md); }

/* Tables */
.table-responsive { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.table { width: 100%; border-collapse: collapse; margin-bottom: var(--spacing-md); }
.table th, .table td { padding: 0.75rem; vertical-align: top; border-top: 1px solid var(--border-color); text-align: left; }
.table thead th { vertical-align: bottom; border-bottom: 2px solid var(--border-color); color: var(--text-strong); font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; }
.table tbody+tbody { border-top: 2px solid var(--border-color); }
.table-hover tbody tr:hover { background-color: var(--color-secondary-50); }

/* Badges */
.badge { display: inline-flex; align-items: center; justify-content: center; padding: 0.25rem 0.625rem; font-size: 0.75rem; font-weight: 600; line-height: 1.2; text-align: center; white-space: nowrap; border-radius: var(--radius-lg); }
.badge-success { color: var(--color-success-600); background-color: var(--color-success-100); border: 1px solid var(--color-success-100); }
.badge-danger { color: var(--color-danger-600); background-color: var(--color-danger-100); border: 1px solid var(--color-danger-100); }
.badge-warning { color: var(--color-warning-600); background-color: var(--color-warning-100); border: 1px solid var(--color-warning-100); }
.badge-info { color: var(--color-info-600); background-color: var(--color-info-100); border: 1px solid var(--color-info-100); }
.badge-secondary { color: var(--text-base); background-color: var(--color-secondary-100); border: 1px solid var(--color-secondary-200); }
.badge-neutral { color: var(--text-base); background-color: var(--color-secondary-100); border: 1px solid var(--color-secondary-200); }